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Pressure 02

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Camels have big feet so they have a large area and the pressure is small. This means they don't sink into soft sand.

Pressure 02

Pressure plays a key role in science. From deep oceans to car tyres, it explains how forces act in liquids, gases, and solids around us every day.

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Fascinating Fact:

Deep-sea fish survive under enormous water pressure that would crush a human.

In KS3 Science, students learn how pressure acts in fluids and solids. It explains weather patterns, hydraulics, and why submarines and aircraft are specially designed to handle extreme pressures.

  • Atmospheric Pressure: The force of air pressing down on Earth, caused by the weight of the atmosphere.
  • Hydraulic System: A system using liquids under pressure to create force, such as in brakes and lifts.
  • Pascal (Pa): The standard unit of pressure, equal to one newton per square metre.
Why don’t deep-sea fish get crushed by pressure?

Deep-sea fish have bodies adapted to high pressure, with flexible structures and no air spaces that could collapse under the weight of the water.

How does pressure change with depth in water?

Pressure increases with depth because the weight of the water above adds more force, making it harder to survive deep in the ocean.

What everyday examples show pressure in action?

Examples include car tyres inflated with air, suction cups sticking to surfaces, and the way snowshoes spread weight to stop sinking.

1 .
A box weighs 100 N. It exerts a pressure of 25 Pa on a table. What is the area of the box in contact with the table?
4 mm2
4 cm2
4 m2
4 km2
Area = force/pressure = 100/25. Remember weight is a force
2 .
A box weighs 20 N. It exerts a pressure of 2 Pa on a table. What is the area of the box in contact with the table?
10 cm2
0.1 m2
10 m2
40 m2
Area = force/pressure = 20/2 = 10 m2
3 .
A skier weighs 600 N and exerts a pressure of 2,500 Pa on the snow. What is the area of the skis?
0.12 m2
0.24 m2
1.2 m2
4.2 m2
Area = 600/2,500 = 0.24 m2
4 .
A skier weighs 600 N, lifts one ski up and exerts a pressure of 5,000 Pa on the snow. What is the area of one of the skis?
0.12 m2
0.24 m2
0.48 m2
1.2 m2
Area = 600/5,000
5 .
A student weighs 500 N, standing on two feet she exerts a pressure of 25,000 Pa on the ground. What is the area of one foot?
50 cm2
0.005 m2
0.01 m2
0.02 m2
Area = 500/25,000 = 0.02 (two feet), one foot = 0.01 m2
6 .
One box weighing 60 N is put on top of one weighing 120 N. The pressure they exert is 180 Pa. What is the area touching the ground?
0.67 m2
1 m2
2 m2
3 m2
Area = (60 + 120)/180
7 .
A 60,000N elephant can stand on one foot! The pressure it exerts is 240,000 Pa. What is the area of its foot?
0.16 m2
0.24 m2
0.25 m2
4 m2
Area = 60,000/240,000
8 .
Camels have big feet so they don't sink into soft sand because .......
they have a large area so the pressure is large
they have a large area so the pressure is small
they have a small area so the pressure is large
they have a small area so the pressure is small
Spreading their weight out over as large an area as possible means they can walk more easily over soft sand
9 .
A sharp knife cuts well because .......
it has a large area so pressure is large
it has a large area so pressure is small
it has a small area so pressure is large
it has a small area so pressure is small
A sharp blade is sharp because it has been ground to a thin edge with a very small area
10 .
Doubling the force and doubling the pressure mean .......
that area doubles
that area gets larger
that area gets smaller
that area stays the same
Area = force/pressure so if you double both force and the pressure, the area over which the force is applied will remain the same
You can find more about this topic by visiting BBC Bitesize - Forces, Pressure and Speed

Author:  Sue Davison (Chemistry Specialist & KS3 Science Teacher, Quiz Writer)

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